why am I like this 😔

So idk where to put this topic but this seems the closest. Lately I've just been feeling meh like I don't know what's wrong I've just been suddenly getting really angry and like slapping my boyfriend for no reason or sad and crying or just snapping at my boyfriend, just like overall being really sensitive. Anyways I don't know if anyone can help me or if they'd want to talk to me my boyfriend says that it's because at my age (15) girls can get depressed and I guess it could be that but I don't get why I would be I think I'm happy, I live with my family and my boyfriend lives with us so I have everyone I love, I have 2 beautiful baby pugs and I'm finishing school early. I don't understand what could be wrong. If anyone would talk to me about stuff or have any ideas of what's worn or how to help it I would appreciate it I want to stop it. Bra if u read all this your the real MVP 😂